Sarvis SL 20˚

Superlight down fill customizable fit mummy bags with REM Flex Pad Sleeve™ that transforms your bag into a Big Agnes System bag

The NEW Sarvis SL series is designed for Mummy bag sleepers who don’t want to roll off their pads. Featuring an attachable half-length REM Flex Pad Sleeve™ to attach your 20 or 25-inch wide pad and give your legs more freedom to flop around. Cinch cold air out of the footbox with the built-in internal cinch system, and adjust both length and width with external clips to minimize cold air spots and maximize heat retention. The adjustable length features are ideal for pre-teen campers to grow into through their college years. Thermally efficient, vertical structured side walls trap heat close to your body while the contoured shape of the hood cradles your head in lofty comfort. This bag's versatility is the perfect companion for multi-night treks or road trips to the desert. 
$299.95 to $319.95
100% Guarantee


Our top priority is to provide customer service as stellar as the award-winning products we create. If one of our products does not perform to your satisfaction, contact our customer service team and we will help you find gear that fits your needs.

Sold exclusively at REI. Click below for a store near you.

Sarvis SL Series

Never roll off your pad again.

Just like your bedsheet at home, slip your pad into the four corners of the pad sleeve to secure your sleep system.

Customized comfort from the ground up.

The highly packable and lightweight Big Agnes Flex Pad Sleeve secures your bag and pad together so you can stay on your pad all night.

Specs + Sizing

Bag WeightRegular: 2lb 5oz / 1.05kg / Long: 2lb 9oz / 1.16kg
Fill WeightRegular: 19oz / 539g / Long: 21oz / 595g
Compressed Bag SizeRegular: 6" x 8" / 15 x 20cm / Long: 7" x 8" 18 x 20cm
Stuff Sack SizeRegular: 8" x 17.5" / 20 x 45cm / Long: 8" x 17.5" / 20 x 45cm
Sleeping Bag TypeTraditional Mummy Bags


These bags offer a Big Agnes System option by using the included
Flex REM Pad Sleeve™ to secure your bag to the pad

Traditional mummy shape allows for lightweight and increased thermal value

Interior built-in cinch system to minimize cold air space in legs and footbox

Exterior clip system at foot to adjust length by 10", making it ideal for pre-teens to grow into

The REM Flex Pad Sleeve™ also doubles as a storage sack

Regular and Long bags fit 20" - 25" wide pads

Vaulted footbox creates more wiggle room for your feet

Contoured hood baffles cradle the head for a more comfortable fit

Oversized interior anti-draft collar

Low-profile cordlock lets you un-cinch the hood with one hand

Insulated tube along upper hood opening seals out drafts when cinched
Internal mesh stash pocket for phones and other little ditties

Interior fabric loops for sleeping bag liners

Exterior loops for hang drying or storage

Storage sack & stuff sack included 

Construction + Materials

Polyester rip-stop shell fabric with a water-repellent finish

Lightweight polyester taffeta lining featuring a wick finish that spreads moisture out for quicker drying and optimal moisture management

650 fill DownTek™ repels water while maintaining insulating value - bluesign® Certified PFOA and PFOS free water repellent chemistry 

Insotect Flow™ vertical baffles contour to your body to provide a more comfortable fit and keep you warmer


Here’s what other people think.

What’s in a Name?

Back in the day, our beloved Sarvis Creek just south of Steamboat Springs was used to transport lumber to the Steamboat Mill for processing. Nowadays, it is one of our favorite places to take a quick overnight backpacking trip or hunt for hungry trout in the early morning hours. If you look close enough you can still see the log flumes used to send timber downriver.